Natrol 5-htp mood & stress 100 mg. Dietary supplement provides calming and relaxing benefits to help you maintain a positive outlook in life. Offering a 100% drug-free and non-habit forming formula, these 45 dietary supplement tablets work by enabling the healthy production of serotonin to help reduce occasional feelings of anxiety. Each tablet in this 45-tablet bottle contains 100 mg. Of plant-sourced 5-htp with controlled two-layer tablet technology for enhanced absorption and assimilation.